Why int 19h point to 7c00? Why int 19h point to 7c00? Jawhar520 (Programmer) (OP) 17 Nov 08 02:20 Does anyone know why int 19h routine load the boot loader to 7c00h?is there any cause? RE: Why int 19h point to 7c00? Salem (Programmer) 17 Nov 08 13:45 Think back to the early 1980's, when 64K was the least memory you could guarantee would exist on a PC.http://en.wikipedia.org/wiki/IBM_PCThat's probably why it's within the first 64K of the address space.If you dig around in the original architecture, you'll probably find a more specific reason. -- If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut. RE: Why int 19h point to 7c00? Jawhar520 (Programmer) (OP) 18 Nov 08 02:55 thank you Salem.